Signal Too Low

Signal too low

Checking the power supply
Check the supply to Combustion Preheater Module (CPM) #9 for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , or a loose connection as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Also check fuse 9 in the engine compartment. The voltage should be 12 V.
Check the cable between #1 on the Ext-X relay (2/29) and #15 on the Combustion Preheater Module (CPM) for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , or for a loose connection as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Also check the relay, the supply to the relay and passenger compartment fuse 24.
If no fault has been found, the fault may have been intermittent.
Do the necessary corrective action.














Continue - Verification

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Verification




Verification

Verification








- Ignition off.
- Connect connector, install components etc.
- Ignition on.

Note! It is important that only the ignition is on for the heater to start up.

- Activate the heater.
A buzzing sound should be heard from the heater.
Check the function of the heater as described in Engine coolant heater, test running Engine Coolant Heater, Test Running.

Additional information:
- For a description of the parameters, see Description of parameters Description of Parameters.
- For a description of activations, see Activating components/functions Activating Components/Functions.





Does the heater work?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFICATION FAILED - Trouble-shooting information

VERIFIED - Fault Found

PAPER - No Fault Found

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Trouble-shooting information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the power supply

FAULT FOUND - Fault Found

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